A5050792356- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Atomic and Subatomic Physics Research
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Nuclear physics research studies
- Cosmology and Gravitation Theories
- Stellar, planetary, and galactic studies
- Nuclear Physics and Applications
- Computational Physics and Python Applications
- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Scientific Research and Discoveries
- Black Holes and Theoretical Physics
- Radiation Detection and Scintillator Technologies
- Airway Management and Intubation Techniques
- Superconducting Materials and Applications
- Library Collection Development and Digital Resources
- Online and Blended Learning
- Cold Atom Physics and Bose-Einstein Condensates
- Astronomy and Astrophysical Research
- Geological and Geophysical Studies
- Astrophysics and Cosmic Phenomena
- Galaxies: Formation, Evolution, Phenomena
University of Kentucky
2015-2024
Kentucky Department of Education
2024
University of Washington
2024
Virginia Tech
2024
University of York
2023
University of California, Irvine
2016-2018
University of Florida
2018
University of California, Santa Barbara
2017
Pacific University Oregon
2015
Fermi National Accelerator Laboratory
2009-2010
Recently a 6.8$\sigma$ anomaly has been reported in the opening angle and invariant mass distributions of $e^+ e^-$ pairs produced $^8\text{Be}$ nuclear transitions. The data are explained by 17 MeV vector gauge boson $X$ that is decay an excited state to ground state, $^8\text{Be}^* \to {}^8\text{Be} \, X$, then decays through $X e^+ e^-$. mediates fifth force with characteristic range 12 fm milli-charged couplings up down quarks electrons, proton coupling suppressed relative neutrons....
The 6.8$\sigma$ anomaly in excited 8Be nuclear decays via internal pair creation is fit well by a new particle interpretation. In previous analysis, we showed that 17 MeV protophobic gauge boson provides physics explanation of the consistent with all existing constraints. Here begin review and characteristics observed anomaly. To develop its interpretation, provide an effective operator analysis for to particles variety spins parities show these considerations exclude simple models scalar...
This document presents a summary of the 2023 Terrestrial Very-Long-Baseline Atom Interferometry Workshop hosted by CERN. The workshop brought together experts from around world to discuss exciting developments in large-scale atom interferometer (AI) prototypes and their potential for detecting ultralight dark matter gravitational waves. primary objective was lay groundwork an international TVLBAI proto-collaboration. collaboration aims unite researchers different institutions strategize...
This paper examines the relationships between four contextual factors related to empowerment (communication with supervisor, general relations company, teamwork, and concern for performance) components of psychological (meaning, impact, self‐determination, competence) identified by Spreitzer her colleagues. We surveyed 203 employees a manufacturing firm, using new established measures Spreitzer’s components. The were found be differentially associated elements empowerment. Communication...
We present evidence for a Galactic North–South asymmetry in the number density and bulk velocity of solar neighborhood stars. The profile, which is derived from main-sequence stars Sloan Digital Sky Survey, shows (North−South)/(North+South) deficit at |z| ≃ 400 pc an excess ∼ 800 pc. Extension Understanding Exploration, gradual trend across midplane as well smaller-scale features. speculate that asymmetry, has appearance wavelike perturbation, intrinsic to disk. explore physics this...
The violation of Baryon Number, $\mathcal{B}$, is an essential ingredient for the preferential creation matter over antimatter needed to account observed baryon asymmetry in universe. However, such a process has yet be experimentally observed. HIBEAM/NNBAR %experiment program proposed two-stage experiment at European Spallation Source (ESS) search number violation. will include high-sensitivity searches processes that violate by one or two units: free neutron-antineutron oscillation...
We study the number density distribution of a sample K and M dwarf stars, matched north south Galactic plane within distance 2 kpc from Sun, using observations Ninth Data Release Sloan Digital Sky Survey. determine distances photometric parallax method, in this context systematic effects exist which could potentially impact determination profile with height plane—and ultimately affect north–south asymmetry. They include: (1) calibration various relations, (2) ability to separate dwarfs...
An intense 120 GeV proton beam incident on an extremely long iron target generates enormous numbers of light-mass particles that also decay within target. If one these decays to a final state with hidden gauge boson, or if such particle is produced as result the initial collision, then weakly interacting hidden-sector may traverse remainder and be detected downstream through its possible ${e}^{+}{e}^{\ensuremath{-}}$, ${\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$,...
The neutron lifetime anomaly has been used to motivate the introduction of new physics with hidden-sector particles coupled baryon number, and on which stars provide powerful constraints. Although may eventually prove be mundane origin, we use it as motivation for a broader review ways that number violation, real or apparent, dark sectors can intertwine how star observables, both present future, constrain them.
We investigate how our baryon-loss limits from anomalous binary-pulsar period lengthening can be interpreted microscopically to yield specific constraints on the particle physics of baryon number violation within a neutron star. focus possibility disappearance via dark processes and scenarios in which produced dark-sector particles do not survive influence response star baryon-number-violating effects. flesh out conditions for this may occur, as well other key assumptions. then turn analysis...
Tensions in the measurements of neutron and kaon weak decays, such as lifetime, may speak to existence new particles dynamics not present Standard Model (SM). In scenarios with dark sectors, that couple feebly those SM appear. We offer a focused overview possibilities describe how observations stars, which probe either their structure or dynamics, limit them. realizing these constraints, we highlight assessment particle processes within dense baryonic matter impacts emerging picture—and...
For decades the primary experimental goal in studies of hadronic parity nonconservation (PNC) has been isolation isovector weak nucleon-nucleon interaction, expected to be dominated by long-range pion exchange and enhanced neutral current. In meson-exchange descriptions this interaction together with an isoscalar generated rho omega dominate most observables. Consequently these two amplitudes have used compare check consistency field's experiments. Yet date, despite sensitive searches like...
We examine the role of ${B}^{0}({B}^{0})\ensuremath{\rightarrow}\ensuremath{\sigma}{\ensuremath{\pi}}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$ decay in Dalitz plot analysis ${B}^{0}({B}^{0})\ensuremath{\rightarrow}\ensuremath{\rho}\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\pi}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$ decays, employed to extract CKM parameter $\ensuremath{\alpha}.$...
Abstract We use the number density distributions of K and M dwarf stars with vertical height from Galactic disk, determined using observations Sloan Digital Sky Survey, to probe structure Milky Way disk across survey’s footprint. Using photometric parallax as a distance estimator we analyze sample several million in matching footprints above below plane, determine location extent asymmetries counts variety thin- thick-disk subsamples regions some 200 square degrees within 2 kpc disk. These...
The standard model predicts that, in addition to a proton, an electron, and antineutrino, continuous spectrum of photons is emitted the β decay free neutron. We report on RDK II experiment which measured photon using two different detector arrays. An annular array bismuth germanium oxide scintillators detected from 14 782 keV. spectral shape was consistent with theory, we determined branching ratio 0.00335±0.00005[stat]±0.00015[syst]. A second large area avalanche photodiodes directly 0.4...
The correlation coefficients a, A, and B in neutron beta decay are proportional to the ratio of axial-vector-to-vector weak coupling constants, gA/gV, leading recoil order. With advent next generation neutron-decay experiments, recoil-order corrections these expressions become experimentally accessible, admitting a plurality standard model (SM) tests. measurement both e.g., allows one test conserved-vector-current (CVC) hypothesis search for second-class currents (SCC) independently....
We determine the magnitude, phase, and $s$ dependence of $\ensuremath{\rho}$-$\ensuremath{\omega}$ ``mixing'' in pion form factor timelike region through fits to ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ data. The associated systematic errors these quantities, arising from functional used fit $\ensuremath{\rho}$ resonance, are small. mass width, however, larger than previously estimated.
The Sivers mechanism for the single-spin asymmetry in unpolarized lepton scattering from a transversely polarized nucleon is driven by orbital angular momentum carried its quark and gluon constituents, combined with QCD final-state interactions. Both mechanisms can generate such asymmetry, though only explain small measured COMPASS collaboration on deuteron, suggesting relative to mechanism. We detail empirical studies through which contributions, quark-flavor quark-flavor, be elucidated.
A Faraday rotation experiment can set limits on the magnetic moment of a electrically-neutral, dark-matter particle, and increase in stringency as candidate-particle mass decreases. Consequently, if we assume particle to be thermal relic, our most stringent constraints emerge at keV scale. We discuss how such an could realized determine function which follow given demonstrated experimental capacities.